Installation guide

Troubleshooting
Troubleshooting Performance Test Problems
1-100
GSM Loopback BER Check
(Option 300 Only)
•Perform:
— All I/Q adjustments
— Internal Digital Modulation Quality
(Option 402 Only)
• If the Internal Digital Modulation Quality
(Option 402 Only) performance test passes, troubleshoot
the following assemblies:
— A9 Digital Demodulator (Option 501, 502, 503, 504
with Option 300)
— A11 Internal Bit Error Rate Analyzer (Option UN7)
— A20 Downconverter (Option 501, 502, 503, 504 with
Option 300)
Table 1-40 Troubleshooting Performance Test Problems
Performance test that is failing... Action to perform...